package com.sky.service.impl;

import com.github.pagehelper.util.StringUtil;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    //统计指定时间内的营业额
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            //select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            LocalDateTime localBeginTime = LocalDateTime.of(localDate ,LocalTime.MIN);
            LocalDateTime localEndTime = LocalDateTime.of(localDate ,LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin",localBeginTime);
            map.put("end",localEndTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 :turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }
    //用户统计
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end){
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> totalUserList = new ArrayList<>();
        List<Integer> newUserList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            LocalDateTime localBeginTime = LocalDateTime.of(localDate ,LocalTime.MIN);
            Map map = new HashMap();
            map.put("end",localBeginTime);
            Integer totalUser = userMapper.countByMap(map);
            totalUser = totalUser == null ? 0 :totalUser;
            totalUserList.add(totalUser);
        }

        for (LocalDate localDate : dateList) {
            LocalDateTime localBeginTime = LocalDateTime.of(localDate ,LocalTime.MIN);
            LocalDateTime localEndTime = LocalDateTime.of(localDate ,LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin",localBeginTime);
            map.put("end",localEndTime);
            Integer newUser = userMapper.countByMap(map);
            newUser = newUser == null ? 0 :newUser;
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }
    //      统计指定时间内的订单数据
    public  OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end){
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        List<Integer> ordercountList = new ArrayList<>();
        List<Integer> validordercountList = new ArrayList<>();
        for (LocalDate localDate : dateList) {
            LocalDateTime localBeginTime = LocalDateTime.of(localDate ,LocalTime.MIN);
            LocalDateTime localEndTime = LocalDateTime.of(localDate ,LocalTime.MAX);
            //每天订单总数
            Integer ordercount = getOrderCont(localBeginTime,localEndTime,null);
            //每天有效订单数
            Integer validordercount = getOrderCont(localBeginTime,localEndTime,Orders.COMPLETED);
            ordercountList.add(ordercount);
            validordercountList.add(validordercount);
        }
        Integer totalOrderCount = ordercountList.stream().reduce(Integer::sum).get();
        Integer validtotalOrderCount = validordercountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validtotalOrderCount.doubleValue()/totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(ordercountList,","))
                .validOrderCountList(StringUtils.join(validordercountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validtotalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    //销量排名
     public SalesTop10ReportVO gettop10(LocalDate begin, LocalDate end){
         LocalDateTime localBeginTime = LocalDateTime.of(begin ,LocalTime.MIN);
         LocalDateTime localEndTime = LocalDateTime.of(end ,LocalTime.MAX);
         List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(localBeginTime,localEndTime);
         List<String> nameList = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
         List<Integer> numberList = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

         return SalesTop10ReportVO.builder()
                 .nameList(StringUtils.join(nameList,","))
                 .numberList(StringUtils.join(numberList,","))
                .build();
    }
    private Integer getOrderCont(LocalDateTime begin, LocalDateTime end,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    //导出报表

    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("tamplate/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
